condition mean min max ZT0-3 0.535459 0.535459 0.535459 ZT4-7 0.128582 0.128582 0.128582 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.5596665 0.5596665 0.5596665